4 DIY garage door maintenance tasks that won't kill you. And 3 that might.

The 4 things you can safely do yourself

1. Lubricate hinges, rollers, and the spring

Use white lithium grease or silicone spray. Don't use WD-40 (it's a solvent, not a lasting lubricant — it strips protective oils). Apply a thin coating to each hinge pivot point, each roller bearing where the stem meets the wheel (keep grease off nylon wheels — silicone is fine there), and lightly along the spring coil. Wipe excess.

Don't lube the tracks themselves. The tracks should stay dry and clean — the rollers run inside them on bearings, and lube just attracts grit. Wipe the tracks down with a dry rag.

Frequency: twice a year is plenty. Once before winter, once in spring.

2. Run a balance test

With the door fully closed, pull the red emergency-release cord on the opener. Lift the door by hand to about 3 feet (waist height). Let go. (Full walkthrough in the 60-second balance test post.)

• If the door stays roughly in place (slight drift OK): balance is good.
• If it drops fast or shoots up: balance is off — a spring is broken, worn out, or wound wrong. That's not a DIY job. Call us.

This is the single most valuable 30 seconds you can spend on garage door maintenance. It tells you whether your spring is still doing its job before the spring tells you by snapping at 6:47 a.m. on a Tuesday.

3. Clean the photo-eye sensors

The two small sensors near the floor, one on each side of the door, keep it from closing on anything in its path. A dirty lens makes the door behave erratically — reversing for no reason, refusing to close.

Wipe each lens with a soft cloth. If alignment looks off (one sensor pointing at the floor, one at the ceiling), nudge them gently until the indicator lights on both glow steady instead of blinking. (More in our photo-eye post.)

4. Test the auto-reverse

UL 325 requires every opener built after 1993 to auto-reverse on contact. To test: place a 2x4 flat on the ground in the door's path, hit the close button. The door should touch the wood and reverse within two seconds.

If it doesn't, the opener's force adjustment is wrong (potentially dangerous, especially with kids or pets in the house). The fix is usually a small knob or dip-switch adjustment on the opener motor — owner's manual will show you. If the manual scares you, leave it for an opener tech.

The 3 things you should never do yourself

1. Wind, unwind, or replace a torsion spring

Spring work is behind the worst garage door DIY injuries we hear about. US safety regulators have long counted garage-door injuries in the tens of thousands a year — most are pinched fingers and people struck by doors, but the ones from springs and cables are the ones that end in surgery. The price difference between DIY and professional spring replacement is not worth a broken wrist or a missing finger. Call us.

2. Replace cables under load

Cables run from the bottom of the door, around the drum at each end of the torsion shaft, holding the door's full weight. Replacing them with the door in place and the spring wound up requires releasing the cable while supporting the door manually — same hazard as the spring. If a cable lets go mid-job, that side of the door drops and the drum can spin the loose end back at you. On our jobs, cables are done with the springs for exactly this reason.

3. Stand on a ladder under a stuck door to "see what's wrong"

If the door is stuck partway up and you don't know why, the spring may have weakened to the point where it could let go entirely. Standing on a ladder under a half-open door puts your head exactly where it will land. If the spring gives up while you're under it, the door comes down in well under a second. Get out from under it. Lower it slowly if you can; leave it where it is if you can't.

What you can pay attention to between professional visits

• Sound. Healthy doors are quiet. New clicking, scraping, or popping noises = stress somewhere.
• Cable look. Open the door halfway, look at the cables from a safe angle. Fraying or rust spots = call.
• Bottom-panel seal. If you see daylight along the bottom, the rubber seal is cracked or worn out. Easy to replace, not our job.
• Tracks. If they're dented, bent, or visibly out of plumb, the door will struggle. We can adjust on a spring visit.
• The numbers. If your springs are over 7 years old in a normal-use home, you're in the failure window. Run the balance test above, or call about replacing them before they break.

Tools worth owning

• White lithium grease (or silicone spray for coastal homes — see the coastal post).
• Soft cloth for photo-eyes.
• 2x4 scrap for the auto-reverse test.
• A flashlight.

That's it. You don't need spring winding bars. If you've been considering buying winding bars, please re-read the DANGER block.